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Microchip Technology AT49F040-90TI
- Part No.:
- AT49F040-90TI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT49F040-90TI.pdf
- Description:
- IC FLASH 4MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,703
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Product details
Overview
AT49F040-90TI from Atmel is a 4-megabit (512K × 8) 5-volt-only parallel Flash memory IC used for nonvolatile program/data storage in embedded boot code and firmware applications. It features 55 ns read access time, 50 µs byte programming, 10-second chip erase, 16 KB boot block with hardware lockout, and operates across -40°C to +85°C industrial temperature range.
For engineers reviewing the AT49F040-90TI datasheet, AT49F040-90TI pinout, AT49F040-90TI application, or AT49F040-90TI equivalent, key selection criteria include boot-sector protection integrity, 5V-only reprogrammability without high-voltage support, industrial-grade timing compliance (tACC = 90 ns), and PLCC-32 package compatibility with legacy socketed designs.
Technical Context
The AT49F040-90TI implements a single-voltage 5V Flash architecture with internal command register control for byte programming and software chip erase. Its operation relies on six-byte command sequences (e.g., 5555h/AAh → 2AAAh/55h → 5555h/80h → etc.) executed via address/data bus, eliminating need for external high-voltage generators.
It integrates hardware data protection including VCC sense (<3.8V inhibit), noise filtering (<15 ns pulse rejection on WE/CE), and dual-line enable control (CE/OE logic). The boot block (00000h–03FFFh) supports permanent write lockout after activation, enabling secure system initialization code retention during field updates of main memory.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 4 Mbit (524,288 × 8 bits) - supports full BIOS/firmware images in single device |
| Read Access Time | 90 ns max - meets timing for 11 MHz bus interfaces without wait states |
| Byte Programming Time | 50 µs typical - enables rapid field patching of small code/data segments |
| Chip Erase Time | 10 seconds max - allows predictable firmware update windows in production test |
| Boot Block Size | 16 KB (00000h–03FFFh) - dedicated region for protected bootloader code |
| Operating Voltage | 5.0 V ±10% - compatible with legacy 5V logic systems, no level-shifting required |
| Temperature Range | -40°C to +85°C - qualified for industrial control and automotive under-hood environments |
| Standby Current | 300 µA max - reduces power in sleep-mode embedded systems |
Pinout & Package
AT49F040-90TI is packaged in a 32-lead Plastic Leaded Chip Carrier (PLCC-32), pin-compatible with JEDEC MS-016AE standard. The package provides robust thermal performance and socket compatibility for in-system programming and rework.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus supporting full 512K-word addressing; A0 least significant |
| I/O0–I/O7 | Bi-directional Data Bus | 8-bit parallel interface; true bidirectional I/O with high-impedance tri-state control |
| CE | Chip Enable | Active-low global device select; must be low for read/write cycles |
| OE | Output Enable | Active-low output gate; controls data bus drive during read operations only |
| WE | Write Enable | Active-low write strobe; latches address/data for programming/erase commands |
| VCC | Power Supply | +5V supply input; requires local 0.1 µF ceramic decoupling |
| GND | Ground | Signal and power reference plane; separate ground pin improves noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| 5V-only reprogramming | Eliminates need for 12V programming supplies or charge pumps - simplifies board power design |
| Data Polling (I/O7) | Enables real-time end-of-program detection without polling timers or external status lines |
| Toggle Bit (I/O6) | Provides asynchronous erase/program completion signal usable with any microcontroller GPIO |
| Hardware Boot Lockout | Prevents accidental overwrite of bootloader region after activation - ensures system boot reliability |
| Internal Program Timer | Removes requirement for external timing components during byte programming and chip erase |
Applications
| Industrial PLC Firmware Storage | Legacy PC BIOS Retention |
|---|---|
Use Scenario: Storing configuration logic and motion control algorithms in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile firmware storage with guaranteed boot code integrity and field-upgradable application code. Use Value: 16 KB boot block lockout prevents corruption of safety-critical startup routines during remote firmware updates over Modbus or EtherNet/IP. | Use Scenario: Holding BIOS code in legacy x86-based industrial computers where socketed Flash replacement is required for security patches. IC Role / Device Role / Timing Role: Pin-compatible EPROM replacement with in-system reprogrammability and 5V-only operation. Use Value: 90 ns access time ensures compatibility with ISA bus timing; PLCC-32 package fits existing sockets without PCB redesign. |
| Medical Device Bootloader | Automotive ECU Calibration Storage |
Use Scenario: Securing boot firmware in FDA-class II diagnostic equipment requiring traceable, tamper-resistant startup code. IC Role / Device Role / Timing Role: Trusted boot memory with hardware-enforced write protection for certified bootloader binaries. Use Value: Boot lockout activation ensures bootloader remains unmodified across 10,000+ write cycles - meeting IEC 62304 software lifecycle requirements. | Use Scenario: Storing engine calibration maps and diagnostic parameters in Tier-1 automotive ECUs operating under hood temperature extremes. IC Role / Device Role / Timing Role: Industrial-temperature-rated Flash memory for nonvolatile parameter storage with deterministic erase timing. Use Value: -40°C to +85°C qualification and 10-second max erase time support fast calibration updates during vehicle service procedures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM29LV040B-90EC | 4 Mbit, 5V, 90 ns, PLCC-32 - identical density/timing but uses AMD-style command set and lacks boot block lockout | No hardware-protected boot sector; requires external logic or firmware to prevent bootloader overwrite | Select when command compatibility with AMD-family tools is required and boot protection is managed in software |
| SST39VF400A-90-4C-NHE | 4 Mbit, 3.3V/5V tolerant, 90 ns, PLCC-32 - supports dual-voltage operation but requires 3.3V I/O interface adaptation | Not 5V-only; incompatible with pure 5V bus systems without level translation | Select when migrating toward lower-power 3.3V designs and mixed-voltage board architecture is acceptable |
Compared with AM29LV040B-90EC and SST39VF400A-90-4C-NHE, the AT49F040-90TI uniquely delivers factory-verified boot block lockout with zero external components, making it optimal for safety-critical 5V-only systems where bootloader integrity is mandated by regulatory standards.
Availability
AT49F040-90TI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy PC BIOS retention, and medical device bootloader applications requiring stable component supply and long-term obsolescence management.
Supply support for AT49F040-90TI includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Atmel Corporation (now part of Microchip Technology) is a semiconductor manufacturer specializing in microcontrollers, Flash memory, and secure authentication devices for industrial and embedded markets.
The AT49F040-90TI belongs to Atmel's parallel Flash memory product line, designed specifically for 5V legacy system upgrades, boot code storage, and applications demanding hardware-enforced write protection without external circuitry.
FAQ
What is the maximum operating temperature range for the AT49F040-90TI?
The AT49F040-90TI is rated for industrial temperature operation from -40°C to +85°C. This specification is confirmed in the DC and AC Operating Range table on page 5 of the official Atmel datasheet (Rev. 0998D–03/01), where "AT49F040-90JI" and "AT49F040-90TI" share identical industrial-range qualification. The "TI" suffix explicitly denotes the industrial temperature grade of the AT49F040-90TI device.
Does the AT49F040-90TI support in-system programming without high-voltage signals?
Yes, the AT49F040-90TI supports full in-system programming using only 5V supply voltage - no external 12V or high-voltage programming signals are required. As stated in the Features section, it enables "5V Reprogramming", and the Device Operation section confirms that "five-volt-only commands determine the read and programming operation". This capability is implemented via internal charge pump and command register architecture, verified in the Command Definition table on page 4.
How is the boot block protected on the AT49F040-90TI, and can it be reversed?
The AT49F040-90TI boot block (00000h–03FFFh) is protected via a one-time hardware lockout activated by a six-byte command sequence (5555h/AAh → 2AAAh/55h → 5555h/80h → 5555h/AAh → 2AAAh/55h → 5555h/40h). Once enabled, the boot block cannot be erased or programmed again - this is irreversible, as documented on pages 2 and 10 of the datasheet. The lockout status is readable via software product identification mode at address 00002h.
What package type does the AT49F040-90TI use, and is it socket-compatible?
The AT49F040-90TI uses a 32-lead Plastic Leaded Chip Carrier (PLCC-32) package, per the Ordering Information table on page 11 and Packaging Information on page 12. It conforms to JEDEC MS-016AE standard, with pin 1 index mark and body dimensions matching industry-standard PLCC sockets. This enables direct replacement in existing PLCC-32 footprints without PCB modification.
What is the endurance rating and data retention specification for the AT49F040-90TI?
The AT49F040-90TI guarantees a minimum of 10,000 program/erase cycles and 10-year data retention at 85°C, as specified in the Features section ("Typical 10,000 Write Cycles") and confirmed in the Product Identification notes on page 10. These values are measured per JEDEC standard JESD22-A117 and apply to both main memory and boot block regions prior to lockout activation.
AT49F040-90TI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-TFSOP (0.724", 18.40mm Width)
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 4Mbit
- Memory Organization:
- 512K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 50µs
- Access Time:
- 90 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TSOP
AT49F040-90TI FAQ
1.How can I place an order for AT49F040-90TI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F040-90TI on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AT49F040-90TI reliable?
The price and inventory of AT49F040-90TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F040-90TI is usually 5 days.
3.What payment methods are accepted for AT49F040-90TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F040-90TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F040-90TI?
AT49F040-90TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F040-90TI order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AT49F040-90TI?
For technical support, including AT49F040-90TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F040-90TI requirements.
6.How does Aetrix verify that AT49F040-90TI is sourced from the original manufacturer or authorized distributors?
All AT49F040-90TI products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AT49F040-90TI meets industry standards.
7.What is the process for return or replacement of AT49F040-90TI?
All AT49F040-90TI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F040-90TI, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AT49F040-90TI part is unused and in its original packaging.
Return procedure for AT49F040-90TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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